//判断是否IE<11浏览器
export function isIE() {
    return navigator.userAgent.indexOf('compatible') > -1 && navigator.userAgent.indexOf('MSIE') > -1

}

export function isIE11() {
    return navigator.userAgent.indexOf('Trident') > -1 && navigator.userAgent.indexOf('rv:11.0') > -1
}

//判断是否IE的Edge浏览器
export function isEdge() {
    return navigator.userAgent.indexOf('Edge') > -1 && !isIE()
}

export function getIEVersion() {
    let userAgent = navigator.userAgent //取得浏览器的userAgent字符串
    let isIE = isIE()
    let isIE11 = isIE11()
    let isEdge = isEdge()

    if (isIE) {
        let reIE = new RegExp('MSIE (\\d+\\.\\d+);')
        reIE.test(userAgent)
        let fIEVersion = parseFloat(RegExp['$1'])
        if (fIEVersion === 7 || fIEVersion === 8 || fIEVersion === 9 || fIEVersion === 10) {
            return fIEVersion
        } else {
            return 6 //IE版本<7
        }
    } else if (isEdge) {
        return 'edge'
    } else if (isIE11) {
        return 11
    } else {
        return -1
    }
}